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How do Missourian’s create greenhouse gas emissions? It’s the fossil fuel, no doubt about it.

The graph at right shows GHG emissions by source for 12 Missouri communities that have conducted GHG inventories. Each column represents a community, and within each column, the colors represent a different GHG source. Blue represents electricity, and it is the largest source of GHG emissions in most communities. Red represents gasoline, diesel, and jet fuel, and it is the next largest source of GHG emissions. Green represents natural gas, and it is the third largest.

We generate electricity mostly by burning coal, which is a fossil fuel. Thus, burning fossil fuel in different ways constitutes the first, second, and third largest sources of GHG emissions. Combined, they total as much as 99% of emissions in some of the communities.

Electricity was the largest source of GHG emissions for every community except Kirkwood and Richmond Heights, where gasoline and diesel represented the largest source.

Why so much GHG from electricity? There are several reasons:

First, we use tremendous amounts of it. For instance, in 2009, Missourians used about 79.7 billion kWh of electricity. How much is that? Enough to drive a Prius around the world 3.8 million times! Electricity is very flexible. We use it to power everything: air conditioning, elevators, lights, stoves, ovens, industrial processes, electric motors, pumps, phones, computers, TVs, sound equipment, medical equipment – everything.

Second, we use it inefficiently. The energy efficiency of coal-burning power plants has averaged 33% over the last decade, and that’s before the electricity leaves the plant. More energy is lost during transmission, and still more is lost by the equipment that consumes it. Only a small part is used for its intended purpose.

You may have heard various rumors about where GHG emissions come from – just the other day I heard a city official propose that it came from cows. But in the communities that conducted GHG inventories, it’s the fossil fuel, no doubt about it.

Sources

For links to the GHG inventories from the 12 jurisdictions, see my previous posts on each one. Here’s a link to a list of previous posts.